Jamaica’s seven-time Olympic champion Usain Bolt ran 20.28 seconds to reach the semi-finals of the men’s 200m.
Bolt, who won the 100m title on Sunday, jogged home in the final 50 metres to win the ninth of 10 heats.
Britain’s Adam Gemili, Danny Talbot and Nethaneel Mitchell-Blake qualified, as did Justin Gatlin of the United States.
“I hate the mornings so I am happy to have this out the way. It’s a good start and I’m happy,” 29-year-old Bolt told BBC Sport.
Gemili ran 20.20 in finishing second in his heat while Gatlin, the 100m silver medallist, clocked 20.42 to win heat five.
Talbot equalled his personal best in running 20.27 in heat one and Mitchell-Blake clocked 20.24 in the final heat.
The semi-finals take place at 02:00 BST on Thursday.